Pencil sharpener



FIG. 1 is a perspective view of a pencil sharpener showing my new design;

FIG. 2 is a right side elevational view thereof, the left side elevational view being substantially a mirror image;

FIG. 3 is a top plan view;

FIG. 4 is a bottom plan view; and,

FIG. 5 is a rear elevational view. 

The ornamental design for pencil sharpener, as shown and described. 